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Setting up multiple ESP8266

Does Mongoose OS support setting up multiple ESP8266 using the same computer + at the same time? I keep getting: Error: write /dev/cu.SLAB_USBtoUART: file already closed when trying to set up wifi, put files on the device, upload the device to AWS IoT, etc. This happens even when I unplug my first ESP8266 (which has been successfully set up).